$(document).ready(function(){
    $("#changeClazz").click(function(){
        var sno = $('.studentSno').text();
        var newCno = $('.clazzs > select >option:selected').val();
        alert(newCno);
        $.ajax({
            url: 'front/studentChangeClazz',
            type: 'post',
            data: {'sno': sno, 'newCno': newCno},
            dataType: 'json',
            success: function (dto) {
                alert(dto.msg);
            }
        });
    });

});